HOAT=Red Pink Yellow or Blue Nice to know Said to use the very best aspects of both IAT and OAT, HOAT is a very protective, long-life coolant. HOAT (Many colors) Hybrid Organic Acid Technology (HOAT) is found in newer Ford, Chrysler and Mercedes vehicles. G30 OAT and Peak Global OAT do NOT use 2-EH Nice to know.2-EH is prone to damage plastics like Nylon 6.6 used in intake manifold gaskets and radiators.DEX-COOL uses Ethylhexanoic Acid (2-EH) as a corrosive inhibitor.Class action suit GM may have to pay for intake gaskets on V-6s (V-8s still being determined) Brown Gunk on radiatorcap Need to know.Rust then causes blockages Need to know.Air causes rust of cast iron and formation of ‘Brown Gunk’.Replace cap and check cap seats if radiator contains air.Root cause seems to be air entering system past the cap and leaking intake manifolds.OAT-continued NAPS=nitrates, amines, phosphate and silicate free Nice to know In fact, Ford, Chrysler and others say to not use this type of coolant in their newer models. The downside of OAT is it is not compatible with other types of coolant (IAT and HOAT). This formula is engineered to offer long-life corrosion protection. OAT (Usually Orange) Organic Acid Technology (OAT) is the formula found in DEX-COOL®, and is usually the antifreeze/coolant of choice for GM, VW, and many Japanese/Asian vehicles. IAT antifreeze can contain: Silicates (possible abrasive dropouts) Phosphates Borates IAT (Usually Green in Color) IAT is considered obsolete and can cause early failure of ceramic-phenolic seals used in newer water pumps. This solution offers fast-acting corrosion protection, but the additives are quickly consumed, exposing the cooling system to possible corrosion problems if not changed regularly. IAT Inorganic Additive Technology (IAT) is the traditional green coolant used in most older vehicles. Should not be used as an indicator what to use-some Chrysler vehicles used HOAT coolant that was green 19 Need to know It also helps us identify the additive package. add color (dye) 18 Need to knowĬolor The color helps us identify a coolant leak. Need to knowĪdditives The major additives: 1. Still toxic but is not as sweet as EG Need to knowĮmbittered Coolant Embittered = tastes awful Embittering agent is required (denatonium benzoate, 30 ppm) Required in California and Oregon since 2004 but not included on the label.More expensive than EG, Increased cost is $/gallon.Not recommended for use by vehicle manufacturers.Pure Water 50/50 Anti-Freeze/Water 70/30 Anti-Freeze/Water Freezing Point 0° C (32° F) -37° C (-35° F) -55° C (-67° F) Boiling Point 100° C (212° F) 106° C (223° F) 113° C (235° F) Freeze & Boil 12 Need to knowĮthylene Glycol Ethylene glycol is the base antifreeze used in every OEM factory fill. Antifreezes (freeze depressants) lower the freeze temperature. Installing a reverse osmosis system Need to knowīurst Pressure Water expands when it freezes, and this creates the burst pressure that can break cooling system components. Purchasing distilled or de- mineralized water 2. What to do? Test the water at the shop and if it has high mineral content, consider: 1. Can have unwanted chlorides, minerals, or salts.Good Water The American Society for Testing and Materials (ASTM) standards for water quality include: Chloride <40 ppm Sulfate <100 ppm Calcium <100 ppm Magnesium <100 ppm Total Hardness <170 ppm pH Range: 5.5-9.0 Iron <1 ppm 7 Nice to know Boils at 212☏ (100☌) The water used in coolant must be clean & pure. Is a very efficient heat exchange fluid 3. Water Water is the principal ingredient and: 1. Corrosion inhibitors (additives) Ethylene Glycol: 47% Water: 50% Coolant 5 Need to know Freeze depressant (Usually ethylene glycol-about 93%) 3. What is Coolant? Additives: About 3% Coolant is a mixture of: 1. Cooling system testing and service procedures.Principles and details about water quality.Purpose and function of engine coolants.Author of many automotive books and lives in Dayton, Ohio. Former flat-rate technician and instructor and a business owner.Former officer in CAT and NACAT Board Member.Retired instructor from Yuba College, Marysville, CA.Coolants Tom Birch Jim Halderman Tom Birch, 3/07 1
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